6 July 2018 Motor control for 0.1-meter diameter crystal retarders on the Daniel K. Inouye Solar Telescope
Author Affiliations +
Abstract
We describe the methods used to control 0.1 meter diameter crystal retarders on the Daniel K. Inouye Solar Telescope (DKIST). The DKIST retarders are required to arrive at, or pass through, requested positions within 7.407 microseconds of the expected time of arrival, with requested rotational velocities of up to 1,800 degrees per second. The motor control system has a Logistic distribution of the time error centered on the expected time of arrival with an RMS error of 1.232 microseconds at that angular velocity. We discuss the use of servo-cycle time compensation techniques, the advantages and disadvantages of the Parabolic Velocity Transfer used to transition between requested positions and velocities, and the methods used to tune both the motor control system and the time coordination system. We evaluate the motor controller’s performance with statistical methods and discuss the unexpected Logistic distribution of the arrival errors.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Austin Kootz, Austin Kootz, } "Motor control for 0.1-meter diameter crystal retarders on the Daniel K. Inouye Solar Telescope", Proc. SPIE 10707, Software and Cyberinfrastructure for Astronomy V, 107071P (6 July 2018); doi: 10.1117/12.2309508; https://doi.org/10.1117/12.2309508
PROCEEDINGS
7 PAGES


SHARE
RELATED CONTENT

Solar feature correlation tracker
Proceedings of SPIE (December 01 1991)
New Swedish solar telescope control system
Proceedings of SPIE (December 13 2002)
GPS-based timing system for LAMOST
Proceedings of SPIE (February 04 2003)
Actuators For A Segmented Mirror Control System
Proceedings of SPIE (November 03 1983)

Back to Top